A liquefied natural gas filling device for ships

Abstract

The application provides a liquefied natural gas filling device for a ship, relates to the technical field of liquefied natural gas filling equipment, and aims to solve the problem that automatic opening and automatic sealing of a connecting pipe can be realized. The device comprises at least: a sealing assembly comprising a sealing block, a first sealing plug, a second sealing plug and a lower sealing ring; a vertical pipe arranged in the connecting pipe away from one end of a gas filling pipe and opposite to the sealing block; a limiting assembly comprising a mounting plate, a supporting rod and an elastic element; and a connecting plate located in the vertical pipe, the top surface of which is fixedly connected with the supporting rod, and the bottom surface of which is connected with the second sealing plug. When gas filling, the sealing plug is opened to realize automatic opening of the connecting pipe under the action of the pressure of liquefied natural gas; when gas filling is completed, the elastic element is reset to realize automatic sealing of the connecting pipe, thereby saving the time of a user for opening or closing the pipeline, improving the gas filling efficiency, and enhancing the safety and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied natural gas filling equipment, and in particular to a liquefied natural gas filling device for ships. Background Art

[0002] Liquefied natural gas (LNG), a clean energy source, is experiencing rapidly growing demand worldwide. LNG is typically transported via power vessels. However, the bunkering process on LNG-powered vessels typically requires the vessel's hold to be higher than the bunkering equipment, and LNG is transported using inclined pipes. This results in excessively long pipelines and large surface areas. LNG is easily vaporized by heat during transportation, leading to increased pressure and potential safety hazards.

[0003] Some documents have given relevant technical solutions around the LNG-powered ship filling device: For example, Chinese patent CN202110018166.6 discloses an LNG-powered ship filling device, which includes a filling vehicle body, a mounting platform is provided on the top of the filling vehicle body, a gas tank and an air pump are provided on the top of the mounting platform, a connecting pipe is fixedly connected between the inner wall of the gas tank and the input end of the air pump, and the output end of the air pump is fixedly connected to the mounting pipe through a joint, a connecting seat is fixedly installed on the top of the side of the filling vehicle body, a delivery pipe is fixedly connected to the inner wall of the heating box away from the mounting pipe, and a filling piston is provided on the end of the delivery pipe away from the heating box, and a control mechanism, an environmental detection module, an alarm module and a storage module are also provided inside the control box. This existing technology controls the height of the heating box so that the delivery pipe and the filling piston can be flush with the cabin input port, thereby reducing the length of the delivery pipe and avoiding the vaporization of liquefied gas due to heat. At the same time, the environmental detection module and the alarm module monitor the filling process of liquefied natural gas in real time to prevent safety accidents. However, the filling system cannot quickly open the gas pipeline, which affects the filling efficiency. Moreover, some LNG filling devices still rely heavily on manual operation, which also poses some safety risks. Therefore, how to design a highly automated and safe marine LNG filling system has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the existing problems of being unable to quickly open the gas filling pipeline and relying on manual operation, the present invention provides a liquefied natural gas filling device for ships. This liquefied natural gas filling device can use the pressure of the liquefied natural gas itself to open the connecting pipe when filling begins, and automatically seals the connecting pipe after filling stops, saving the user time in opening or closing the pipeline. It is simple and convenient to operate, improving filling efficiency while enhancing safety and reliability.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a liquefied natural gas filling device for ships, comprising: a filling pipe and a connecting pipe located downstream of the filling pipe and tightly connected to the filling pipe, wherein the connecting pipe is provided with:

[0006] The sealing assembly includes: a sealing block, a first sealing plug, a second sealing plug, and a lower sealing ring. The sealing block is located at an end of the connecting pipe close to the gas filling pipe, the first sealing plug is located at a side of the sealing block away from the gas filling pipe, and the lower sealing ring is arranged opposite to the first sealing plug and is in transmission connection with the first sealing plug.

[0007] A vertical pipe is arranged in the connecting pipe away from one end of the gas filling pipe and opposite to the sealing block, the lower sealing ring is sleeved on the outer periphery of the vertical pipe near one end of the sealing block, the second sealing plug is arranged in the vertical pipe, and the end of the vertical pipe away from the gas filling pipe is fixed to the inner wall of the connecting pipe;

[0008] The limiting assembly includes: a mounting plate, a support rod and an elastic element, wherein the mounting plate is arranged in one end of the vertical tube near the sealing block, one end of the support rod is connected to the first sealing plug, and the other end passes through the mounting plate and extends into the vertical tube, the support rod can move up and down relative to the mounting plate, and the elastic element is sleeved on the outer circumference of the support rod, one end of the elastic element is connected to the first sealing plug and the other end is fixed to the mounting plate;

[0009] A connecting plate is located in the vertical pipe, wherein the top surface of the connecting plate is fixedly connected to the support rod, and the bottom surface of the connecting plate is connected to the second sealing plug.

[0010] Optionally, the gas filling pipe and the connecting pipe are detachably connected.

[0011] Optionally, one or more through holes are provided on the mounting plate, and these through holes allow liquefied natural gas to pass through.

[0012] Optionally, a support plate is included, which is located at the end away from the vertical pipe to fix the vertical pipe to the inner wall of the connecting pipe.

[0013] Optionally, the support plate and the vertical pipe are an integrated structure, or the support plate and the vertical pipe are fixedly connected.

[0014] Optionally, through grooves are provided in the middle of both sides of the support plate.

[0015] Optionally, the connecting pipe also includes a transmission assembly, which includes: a rotating shaft, a gear, a first rack and a second rack, the first rack is located on the bottom surface of the first sealing plug opposite to the sealing block, one end of the second rack is slidably connected to the bottom surface of the sealing block, and the other end is fixed to the lower sealing ring, the gear is sleeved on the outer circumference of the rotating shaft, and the gear is engaged with the first rack and the second rack.

[0016] Optionally, the transmission assembly further includes a second groove, a limiting rod and a slide groove, the second groove is located on the side of the bottom of the sealing block close to the connecting pipe, the limiting rod is fixedly connected in the second groove, and the slide groove is located on the bottom surface of the second rack.

[0017] Optionally, a connecting rod is further included, the connecting tube is an L-shaped connecting rod, the vertical rod of the L-shaped connecting rod passes through the second sealing plug and is fixedly connected to the connecting plate, and the inner wall of the cross rod is tightly fitted with the support plate.

[0018] Optionally, a third sealing plug is fixed on the inner wall of the connecting rod cross bar, and the third sealing plug is tightly fitted with the through groove.

[0019] Compared with the prior art, the beneficial effects of this application include at least:

[0020] In a liquefied natural gas filling device of the present invention, the sealing component, the limit component, and the transmission component cooperate with each other to realize the automatic opening of the connecting pipe during gas filling, so that liquefied natural gas enters the connecting pipe from the gas filling pipe. When gas filling is completed, the connecting pipe can be automatically sealed. In addition, the sealing plug, the sealing block, and the sealing ring cooperate with each other to improve the sealing performance and safety of the device. Specifically, it includes:

[0021] The spring is compressed by the pressure of liquefied natural gas itself, the first sealing plug is opened, and the connecting pipe is opened, which saves the user time in opening the pipeline.

[0022] The L-shaped connecting pipe and the sealing plug cooperate with each other to realize the opening and closing of the through-groove, thereby increasing the flow rate through the connecting pipe during gas filling and improving the gas filling efficiency;

[0023] After the gas filling is completed, the connecting pipe is automatically closed by compressing the spring to return to its original position, saving time and improving work efficiency;

[0024] The sealing block and the sealing ring cooperate with each other to improve the sealing performance of the gas filling pipe and the connecting pipe, thereby improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 A schematic diagram of a liquefied natural gas filling device for a ship provided by the embodiment of the present application is shown.

[0027] Figure 2 A schematic diagram of Figure 1 A partial enlarged view of the I part in the figure.

[0028] Figure 3 A schematic diagram of Figure 1 A partial enlarged view of the II part in the figure.

[0029] Figure 4 A schematic diagram of Figure 1 A partial enlarged view of the III part in the figure.

[0030] In the figure: 1, gas filling pipe; 2, connecting pipe; 3, joint; 4, sealing block; 5, first through hole; 6, first groove; 7, support plate; 8, vertical pipe; 9, first sealing plug; 10, mounting plate; 11, second through hole; 12, support rod; 13, elastic element; 14, connecting plate; 15, second sealing plug; 16, through groove; 17, connecting rod; 18, third sealing plug; 19, lower sealing ring; 20, rotating shaft; 21, gear; 22, first rack; 23, second rack; 24, second groove; 25, limiting rod; 26, sliding groove; 27, upper sealing ring. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail by specific, concrete examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied by different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0032] It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concept of the present application, and therefore only show the components related to the present application in the diagrams, but are not drawn according to the number, shape and size of the components in actual implementation. The type, number and ratio of each component in actual implementation can be arbitrarily changed, and the layout type of the components can also be more complex.

[0033] EMBODIMENT

[0034] As Figure 1As shown, this embodiment provides a liquefied natural gas (LNG) filling device for ships, comprising a filling pipe 1, a connecting pipe 2 located downstream of the filling pipe 1, a sealing assembly, a riser 8, a stop assembly, and a connecting plate 14. The filling pipe 1 and the connecting pipe 2 are detachably connected, for example, by threaded connection or other connection methods that achieve detachable connection and meet sealing requirements, such as plug-in connection.

[0035] like Figure 1 As shown, in this embodiment, the gas filling pipe 1 and the connecting pipe 2 are connected by a threaded connection. To achieve this threaded connection, a joint 3 is integrally fixedly mounted at the end where the gas filling pipe 1 and the connecting pipe 2 are connected. The outer periphery of the joint 3 is provided with an external thread, and the inner periphery of the corresponding end of the connecting pipe 2 is formed with an internal thread that cooperates with the external thread. The internal and external threads cooperate with each other to achieve the connection between the gas filling pipe 1 and the connecting pipe 2.

[0036] like Figure 1 As shown, the sealing assembly includes a sealing block 4, a first sealing plug 9, and an upper sealing ring 27. The upper sealing ring 27 is fixedly mounted inside the connecting pipe 2. The top surface of the upper sealing ring 27 abuts against the bottom surface of the joint 3 of the gas filling pipe 1. The outer side of the upper sealing ring 27 tightly engages with the inner wall of the connecting pipe 2 and the bottom surface of the joint 3, achieving a preliminary seal. A sealing block 4 is fixedly mounted on the bottom surface of the upper sealing ring 27. The outer side wall of the sealing block 4 also abuts against the inner side wall of the connecting pipe 2, achieving a seal. A first through-hole 5 is defined in the center of the sealing block 4. The diameter of the first through-hole 5 is the same as or slightly smaller than the inner diameter of the upper sealing ring 27. This first through-hole 5 enables communication between the gas filling pipe 1 and the connecting pipe 2 to facilitate gas filling. A first groove 6 is formed on the bottom surface of the sealing block 4. The depth of the first groove 6 is less than the height of the sealing block 4, for example, 1 / 3 to 1 / 2 of the height of the sealing block 4. The first groove 6 is formed into a convex structure that is smaller at the top and larger at the bottom, that is, the inner diameter of the first groove 6 close to the top surface of the sealing block 4 is smaller than the inner diameter of the first groove 6 on the bottom side of the sealing block 4. At the same time, the inner diameter of the first groove 6 close to the top surface of the sealing block 4 is larger than the diameter of the first through hole 5 in the sealing block 4.

[0037] The first sealing plug 9 is arranged in the first groove 6, and the first sealing plug 9 has an external structure complementary to the first groove 6, that is, the first sealing plug 9 is formed into a boss-type structure that is small at the top and large at the bottom. Furthermore, the height of the first sealing plug 9 can be greater than the depth of the first groove 6, and the bottom of the first sealing plug 9 is formed into a flange structure or similar structure. When the first sealing plug 9 and the first groove 6 are installed in cooperation with each other, the flange structure fits with the sealing block 4 around the first groove 6 to play a further sealing role. At the same time, the flange structure can also prevent the first sealing plug 9 from being excessively pressed into the first groove 6. The design of the above-mentioned components of the sealing assembly can improve the sealing performance when the gas filling pipe 1 is connected to the connecting pipe 2, prevent liquefied natural gas leakage during the gas filling process, and improve the safety of the device.

[0038] like Figure 1 As shown, the liquefied natural gas filling device for ships of this embodiment also includes a standpipe 8 and a connecting plate 14. The standpipe 8 is arranged at the end of the connecting pipe 2 away from the gas filling pipe 1 and is arranged opposite to the sealing block 4. Furthermore, the standpipe 8 and the sealing block 4 are coaxially arranged. The end of the standpipe 8 away from the gas filling pipe 1 is fixed to the inner wall of the connecting pipe 2, and optionally, is fixed to the inner wall of the connecting pipe 2 through a support plate 7. The support plate 7 and the standpipe 8 can be an integral structure, such as a flange structure extending from the end of the standpipe 8 toward the inside of the connecting pipe 2; or they can be independent components fixedly connected to each other, such as an annular plate that is sleeved, bonded, riveted or welded to the end of the standpipe 8.

[0039] The connecting plate 14 is located in the vertical pipe 8 and can move up and down relative to the vertical pipe 8. In an optional embodiment, in order to achieve the up and down movement of the connecting plate 14 in the vertical pipe 8 without causing damage to the inner wall of the vertical pipe 8, the outer diameter of the connecting plate 14 is set to be smaller than the inner diameter of the vertical pipe 8. In this embodiment, it is also necessary to achieve sealing between the vertical pipe 8 and the connecting pipe 2, so the above-mentioned sealing assembly also includes a second sealing plug 15 arranged in the vertical pipe, and the second sealing plug 15 is fixed to the bottom surface of the connecting plate 14, so that the second sealing plug 15 can move as the connecting plate 14 moves up and down in the vertical pipe 8, and the outer periphery of the second sealing plug 15 is tightly fitted with the inner wall of the vertical pipe 8, thereby achieving sealing of the vertical pipe 8. Similarly, in order to increase the sealing between the vertical pipe 8 and the connecting pipe 2, the above-mentioned sealing assembly also includes a lower sealing ring 19 mounted on the upper end of the vertical pipe 8. The lower sealing ring 19 is mounted on the outer periphery of the vertical pipe 8 near the end of the sealing block 4, and the inner periphery of the lower sealing ring 19 is tightly fitted with the outer side wall of the vertical pipe 8, and the outer periphery is tightly fitted with the interior of the connecting pipe 2.

[0040] like Figure 1 and 3As shown, the LNG filling device for the ship of the embodiment further comprises a limiting assembly, specifically comprising a mounting plate 10, a support rod 12 and an elastic element 13. The mounting plate 10 is fixedly arranged at one end of the stand pipe 8 close to the sealing block 4, and the mounting plate 10 is provided with gas inlet holes allowing the LNG to pass through, and a second through hole 11 is formed in the middle region of the mounting plate 10. The support rod 12 is arranged in the middle of the connecting pipe 2 and coaxially arranged with the connecting pipe 2. One end of the support rod 12 is fixedly connected with the first sealing plug 9, and the other end is fixedly connected with the support plate 14 through the second through hole 11 of the mounting plate 10, and the support rod 12 is movable up and down relative to the mounting plate 10. In order to realize the up and down movement of the support rod 12 through the second through hole 11 of the mounting plate 10 without damaging the mounting plate 10, the diameter of the second through hole 11 is greater than the diameter of the support rod 12. The support rod 12 is sleeved with the elastic element 13, which can be a spring, and one end of the elastic element 13 is fixedly connected with the first sealing plug 9, and the other end is fixedly connected with the mounting plate 10, which can realize the reset of the support rod 12.

[0041] The above structure design, at the beginning of filling, under the action of pressure, the LNG drives the first sealing plug 9 to move away from the filling pipe 1, so that the first sealing plug 9 gradually separates from the first groove 6, and the connecting plate 14 at the lower end of the support rod 12 and the second sealing plug 15 are slowly moved away from the filling pipe 1, until the stand pipe 8 is removed, at this time the elastic element 13 is compressed, realizing the communication of the filling pipe 1 and the connecting pipe 2, and the LNG realizes the delivery of the filling pipe 1 to the connecting pipe 2; when stopping filling, the pressure in the filling pipe 2 decreases, the first sealing plug 9 moves to the side close to the filling pipe 1 under the pressure of the elastic element 13, until the first sealing plug 9 gradually fits the first groove 6 tightly, realizing the closure of the connecting pipe. When the first sealing plug 9 drives the support rod 12 connected therewith to move downward, the support rod 12 can drive the second sealing plug 15 connected therewith to move downward synchronously through the connecting plate 14 connected therewith, and when the second sealing plug 15 moves out of the stand pipe 8, the communication of the stand pipe 8 is realized, so that the natural gas can be filled through the stand pipe 8, and after the first sealing plug 9 moves out of the first groove 6, the lower sealing plug 15 moves out of the stand pipe 8, which can slow down the impact of the LNG entering the connecting pipe 2.

[0042] With the cooperation of the sealing assembly, standpipe 8, and stopper assembly, this structure allows connecting pipe 2 to automatically open at the start of refueling, allowing liquefied natural gas (LNG) to enter connecting pipe 2 from refueling pipe 1 through first through-hole 5; at the end of refueling, connecting pipe 2 automatically closes. Furthermore, the pressure exerted on first sealing plug 9 by elastic element 13 allows it to more tightly fit against the inner wall of first groove 6, significantly improving the sealing performance of the device. Furthermore, the cooperation of second sealing plug 15 and standpipe 8 achieves a delayed opening effect, providing a corresponding buffering effect on LNG entering connecting pipe 2.

[0043] like Figure 2 As shown, the liquefied natural gas bunkering device for ships of this embodiment also includes a transmission assembly. Specifically, the transmission assembly comprises a rotating shaft 20, a gear 21, a first rack 22, and a second rack 23. The first rack 22 is located on the bottom surface of the first sealing plug 9 opposite the sealing block 4. One end of the second rack 23 is slidably connected to the bottom surface of the sealing block 4, and the other end is fixed to the lower sealing ring 19. The gear 21 is sleeved on the outer periphery of the rotating shaft 20 and meshes with the first rack 22 and the second rack 23. The transmission assembly is preferably arranged symmetrically with respect to the central axis of the connecting pipe 2 to ensure transmission stability.

[0044] like Figure 1 As shown, in an optional embodiment, in order to improve the gas filling efficiency, a plurality of through grooves 16 are provided on the support plate 7, and the through grooves 16 can realize the communication between the upper and lower sides of the connecting plate 7. In order to ensure the sealing when the through grooves 16 are not needed for communication, a third sealing plug 18 is provided in the through groove 16, and the third sealing plug 18 fits tightly with the through groove 16. Furthermore, in order to move the third sealing plug 18 out of the through groove 16 and realize the communication of the through groove 16, a connecting rod 17 is also provided in this optional embodiment. The connecting rod 17 is formed as an L-shaped connecting rod, and the vertical rod of the L-shaped connecting rod is fixedly connected to the second sealing plug 15, or passes through the second sealing plug 15 and is fixedly connected to the connecting plate 14, so that the connecting rod 17 moves with the movement of the connecting plate 14. The cross bar of the L-shaped connecting rod extends from the end of the vertical rod toward the side wall of the connecting pipe 2, and the third sealing plug 18 is fixedly connected to the cross bar. To ensure that the L-shaped connecting rod does not damage the inner walls of the connecting tube 2 and the vertical tube 8, a gap is left between the crossbar and the inner wall of the connecting tube 2, and a gap is also left between the vertical rod and the inner wall of the vertical tube 8. When air is not added, that is, when there is no pressure difference between the inside and outside of the vertical tube 8, the crossbar of the connecting rod 17 fits tightly against the support plate 7, and the third sealing plug 15 fits tightly against the through groove 16.

[0045] When liquefied natural gas is transported from the filling pipe 1 to the connecting pipe 2 and the first sealing plug 9 moves away from the filling pipe 1, opening the first groove 6, the first sealing plug 9, via the first rack 22 connected thereto, drives the corresponding gear 21 to rotate. The gear 21 then drives the corresponding second rack 23 to move in the direction opposite to the first rack 22. At this time, driven by the second rack 23, the lower sealing ring 19 connected thereto moves toward the side closer to the filling pipe 1, separating the lower sealing ring 19 from the standpipe 8. Furthermore, as the first sealing plug 9 moves away from the filling pipe 1, the support rod 12 also drives the connecting rod 17 away from the filling pipe 1, causing the third sealing plug 18 to gradually disengage from the through-groove 16. At this point, the liquefied natural gas entering the connecting pipe 2 can flow through the gap between the outer periphery of the standpipe 8 and the inner wall of the connecting pipe 2, passing through the through-groove 16.

[0046] With the cooperation of the transmission assembly, the connecting rod and the through groove, the flow rate of the liquefied natural gas passing through the connecting pipe 2 is increased, thereby improving the gas filling efficiency of the device.

[0047] Further Figure 2 As shown, the transmission assembly of the liquefied natural gas filling device for ships in this embodiment also includes a limiting rod 25 and a slide 26. A second groove 24 is provided on the side of the sealing block 4 away from the gas filling pipe 1 and close to the connecting pipe 2. The height of the second groove 24 is less than the height of the sealing block 4. The limiting rod 25 is installed in the second groove 24. One end of the limiting rod 25 is fixed in the sealing block 4, and the other end is fixedly connected to the second rack 23. In order to ensure that the sliding of the rack and the gear 21 is more stable, a slide 26 is provided on the inner side of the second rack 23. The above-mentioned transmission assembly is preferably arranged in a symmetrical manner relative to the central axis of the connecting pipe 2, thereby ensuring the stability of the transmission.

[0048] The second rack 23 is limited by the mutual cooperation between the limiting rod 25 and the second groove 24, which can improve the stability of the second rack 23 during movement, and further improve the stability of the lower sealing ring 19 during movement, ensuring that the lower sealing ring 19 can be smoothly installed on the vertical pipe 8, thereby improving the sealing and reliability of the device.

[0049] When the liquefied natural gas filling device for ships of this embodiment is in use, with the cooperation of the sealing assembly, the vertical pipe 8 and the limit assembly, the liquefied natural gas filling device can realize automatic opening and automatic closing of liquefied natural gas from the gas filling pipe 1 to the connecting pipe 2; further, through the mutual cooperation of the second sealing plug 15 and the vertical pipe 8, the effect of delayed opening of the vertical pipe 8 can be achieved, which has a corresponding buffering effect on the liquefied natural gas entering the connecting pipe 2; further, through the mutual cooperation of the transmission assembly, the connecting rod 17, the through groove 16 and the third sealing plug 18, the flow rate of liquefied natural gas through the connecting pipe 2 is increased, thereby improving the gas filling efficiency of the device.

[0050] The LNG filling device for the ship of the embodiment can preliminarily seal the inner wall of the connecting pipe 2 by the cooperation of the second sealing plug 15 and the stand pipe 8 when in use; further, the sealing between the outer periphery of the stand pipe 8 and the inner wall of the connecting pipe 2 can be realized by the lower sealing ring 19, so as to further improve the sealing performance of the device; in addition, the top surface of the sealing block 4 is fixedly installed with the upper sealing ring 27, and the top surface of the upper sealing ring 27 is in close contact with the bottom surface of the joint 3, so as to further improve the sealing performance of the device.

[0051] The above merely provides the preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquefied natural gas filling device for a ship, comprising a filling pipe (1) and a connecting pipe (2) located downstream of the filling pipe (1) and tightly connected to the filling pipe (1), characterized in that: The connecting pipe (2) is provided with: A sealing assembly comprises: a sealing block (4), a first sealing plug (9), a second sealing plug (15), and a lower sealing ring (19); the sealing block (4) is located at one end of the connecting pipe (2) close to the gas filling pipe (1); the first sealing plug (9) is arranged on a side of the sealing block (4) away from the gas filling pipe (1); and the lower sealing ring (19) is arranged opposite to the first sealing plug (9) and is in transmission connection with the first sealing plug (9); A vertical pipe (8) is arranged in the connecting pipe (2) at one end away from the gas filling pipe (1) and is arranged opposite to the sealing block (4); the lower sealing ring (19) is sleeved on the outer periphery of the vertical pipe (8) at one end close to the sealing block (4); the second sealing plug (15) is arranged in the vertical pipe (8); and the end of the vertical pipe (8) away from the gas filling pipe (1) is fixed to the inner wall of the connecting pipe (2); A limit assembly comprises: a mounting plate (10), a support rod (12) and an elastic element (13); the mounting plate (10) is arranged in one end of the vertical tube (8) close to the sealing block (4); one end of the support rod (12) is connected to the first sealing plug (9), and the other end passes through the mounting plate (10) and extends into the vertical tube (8); the support rod (12) can move up and down relative to the mounting plate (10); the elastic element (13) is sleeved on the outer periphery of the support rod (12); one end of the elastic element (13) is connected to the first sealing plug (9) and the other end is fixed to the mounting plate (10); A connecting plate (14) is located in the vertical pipe (8), the top surface of the connecting plate (14) is fixedly connected to the support rod (12), and the bottom surface is connected to the second sealing plug (15); A transmission assembly comprises: a rotating shaft (20), a gear (21), a first rack (22) and a second rack (23), wherein the first rack (22) is located on the bottom surface of the first sealing plug (9) opposite to the sealing block (4), one end of the second rack (23) is slidably connected to the bottom surface of the sealing block (4), and the other end is fixed to the lower sealing ring (19), the gear (21) is sleeved on the outer periphery of the rotating shaft (20), and the gear (21) and the first rack (22) and the second rack (23) are engaged with each other.

2. The liquefied natural gas filling device for ships according to claim 1, characterized in that: The gas filling pipe (1) and the connecting pipe (2) are detachably connected.

3. The liquefied natural gas filling device for ships according to claim 1, characterized in that: One or more through holes are provided on the mounting plate (10), and these through holes allow liquefied natural gas to pass through.

4. The liquefied natural gas filling device for ships according to claim 1, characterized in that: It comprises a support plate (7) located at one end of the vertical pipe (8) away from the sealing block (4) to fixedly connect the vertical pipe (8) to the inner wall of the connecting pipe (2).

5. The liquefied natural gas filling device for ships according to claim 4, characterized in that: The support plate (7) and the vertical pipe (8) are an integrated structure, or the support plate (7) and the vertical pipe (8) are fixedly connected.

6. The liquefied natural gas filling device for ships according to claim 4, characterized in that: Through slots (16) are provided at the middle positions of both sides of the support plate (7).

7. The liquefied natural gas filling device for ships according to claim 1, characterized in that: The transmission assembly further comprises a second groove (24), a limiting rod (25) and a sliding groove (26), wherein the second groove (24) is located on a side of the bottom of the sealing block (4) close to the connecting pipe (2), the limiting rod (25) is fixedly connected in the second groove (24), and the sliding groove (26) is located on the bottom surface of the second rack (23).

8. The liquefied natural gas filling device for ships according to claim 6, characterized in that: It also includes a connecting rod (17), which is an L-shaped connecting rod. The vertical rod of the L-shaped connecting rod passes through the second sealing plug (15) and is fixedly connected to the connecting plate (14), and the inner wall of the cross rod is tightly fitted with the support plate (7).

9. The liquefied natural gas filling device for ships according to claim 8, characterized in that: A third sealing plug (18) is fixed on the inner wall of the crossbar of the connecting rod (17), and the third sealing plug (18) is tightly fitted with the through groove (16).

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